Flow field plate, electrolytic bath and electrolysis device
By designing inlet channels, outlet channels, and branch channels on the flow field plate, the problems of uneven fluid distribution and mass transfer dead zones in large-area electrolytic cells were solved, achieving uniform fluid distribution, improving electrolysis efficiency, and reducing electrolysis power loss.
Patent Information
- Application Number
- CN202422799209.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-15
AI Technical Summary
Existing proton exchange membrane electrolyzers suffer from uneven water distribution and mass transfer dead zones in large-area applications, resulting in low electrolysis efficiency.
Design a flow field plate that includes an inlet zone, an outlet zone, and a reaction zone. The flow channel is equipped with an inlet channel, an outlet channel, and a group of branch channels. These channels achieve uniform distribution of fluid and avoid the generation of mass transfer dead zones.
In large-area electrolytic cells, uniform fluid distribution is achieved, reducing power loss during electrolysis and improving electrolysis performance and efficiency.
Smart Images
Figure CN223522686U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electrolytic water technical field especially relates to a flow field plate, electrolytic tank and electrolytic device. BACKGROUND
[0002] With the rapid development of society, the pursuit of energy of human is increasingly intense, however the overconsumption of non-renewable fossil energy causes environmental pollution and energy crisis, electrolytic water hydrogen production as a kind of zero carbon emission, obtain clean energy technology, has received extensive research, the existing proton exchange membrane electrolytic cell usually operates at lower temperature (30-80 DEG C) and high current density (2-4A / cm2), and produces ultra-purity hydrogen and oxygen.
[0003] With the maturity of proton exchange membrane electrolytic cell electrolytic water technology, higher current density can be realized, and the increase of current density will produce more oxygen and hydrogen, then the removal of oxygen and hydrogen needs to be effectively transported by the water inlet of proton exchange membrane electrolytic cell, and in order to realize large-scale hydrogen production, the size of proton exchange membrane electrolytic cell is increasing, and because different sizes have different mass transfer characteristics, the small-area reaction flow channel cannot be directly copied to large-area reaction flow channel, with the application of large-area proton exchange membrane electrolytic cell, but the traditional reaction flow channel plate still has many problems, and there are problems such as uneven water distribution and mass transfer dead zone of large-area bipolar plate.
[0004] In view of this, we propose a flow field plate, electrolytic tank and electrolytic device to solve the above problems. INVENTION CONTENTS
[0005] The utility model discloses a kind of flow field plate, electrolytic tank and electrolytic device, to be able to realize the uniform distribution of fluid in large-area electrolytic tank in multiple branch flow channel, avoid the generation of flow dead zone.
[0006] To achieve the above object, the flow field plate provided by the utility model is formed with an inlet area, an outlet area and a reaction area, a plurality of flow channels are provided in the reaction area, and the fluid flows into the outlet area after flowing into the plurality of flow channels of the reaction area from the inlet area;
[0007] The plurality of flow channels include:
[0008] Inflow channel, end portion is communicated with the inlet area;
[0009] Two outflow channels, the end portion of each outflow channel is communicated with the outlet area, and the two outflow channels are arranged on the two sides of the inflow channel width direction;And,
[0010] Two branch flow passage groups, each of the branch flow passage groups comprising a plurality of branch flow passages, each of the branch flow passages having one end communicated with the side of the inlet flow passage and the other end communicated with the corresponding side of the outlet flow passage.
[0011] In an embodiment, the two branch flow passage groups are symmetrically arranged with the length direction center line of the inlet flow passage as the axis of symmetry.
[0012] In an embodiment, each of the branch flow passages is arranged at intervals along the side of the inlet flow passage, and the intervals are the same.
[0013] In an embodiment, each of the branch flow passages is arranged to be inclined towards the inlet flow passage away from the side of the outlet flow passage, and the inclination angles are the same.
[0014] In an embodiment, the width of the inlet flow passage is gradually reduced from the inlet area towards the outlet area.
[0015] In an embodiment, the two outlet flow passages are arranged in parallel on both sides of the width direction of the inlet flow passage.
[0016] The length and / or width of the inlet flow passage and the two outlet flow passages are the same.
[0017] In an embodiment, each of the branch flow passages has the same depth as the inlet flow passage; and / or,
[0018] Each of the branch flow passages has the same depth as the outlet flow passage; and / or,
[0019] The width of each of the branch flow passages is the same as the width of the outlet flow passage.
[0020] In an embodiment, each of the branch flow passages has the same width and / or depth.
[0021] The utility model also proposes a kind of electrolytic cell, including above-mentioned flow field plate.
[0022] The utility model also proposes a kind of electrolytic device, including above-mentioned electrolytic cell.
[0023] The technical scheme of the utility model is by adopting the inlet area arranged on the flow field plate, fluid can be conveniently entered from the inlet area, and after passing each flow passage in the reaction area, it is discharged through the outlet area, wherein fluid enters the inlet flow passage, and is uniformly distributed by two branch flow passage groups, and finally flows into the outlet flow passage and is discharged through the outlet area, by arranging a plurality of branch flow passages on the flow field plate, the purpose of uniformly distributing fluid in large-area electrolytic cell is achieved, the generation of mass transfer dead zone is avoided, the power loss during electrolysis is effectively reduced, and the electrolysis performance is improved. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.
[0025] Figure 1 The structural schematic diagram of one embodiment of the flow field plate provided by the present application.
[0026] Explanation of reference numerals:
[0027] 100, flow field plate; 1, inlet area; 2, outlet area; 3, reaction area; 31, flow channel; 311, inlet flow channel; 312, outlet flow channel; 313, branch flow channel group; 3131, branch flow channel.
[0028] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION
[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.
[0031] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that the technical solutions can be realized by those skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.
[0032] With the rapid development of society, human's pursuit of energy is increasingly strong, however, the over-consumption of non-renewable fossil energy has caused environmental pollution and energy crisis; water electrolysis as a technology that can achieve zero carbon emission and obtain clean energy has been widely studied; the existing proton exchange membrane electrolyzer usually operates at a low temperature (30-80℃) and a high current density (2-4A / cm2), and produces ultra-pure hydrogen and oxygen.
[0033] With the maturity of water electrolysis technology of proton exchange membrane electrolyzer, higher current density can be achieved, and increasing current density will produce more oxygen and hydrogen, so the removal of oxygen and hydrogen needs to be effectively transported by the water inlet of the proton exchange membrane electrolyzer; in order to realize large-scale hydrogen production, the size of the proton exchange membrane electrolyzer is increasing accordingly, and because different sizes have different mass transfer characteristics, the small-area reaction flow channel cannot be directly copied to the large-area reaction flow channel; with the application of large-area proton exchange membrane electrolyzer, the traditional reaction flow channel plate still has many problems, such as uneven water distribution and mass transfer dead zone of the large-area bipolar plate.
[0034] In view of this, a flow field plate, electrolyzer and electrolysis device are proposed to solve the above problems.
[0035] The utility model provides a kind of flow field plate, electrolyzer and electrolysis device, it aims at being able to realize the uniform distribution of fluid in large-area electrolyzer in multiple branch flow channel, avoid the generation of flow dead zone.
[0036] Please refer to Figure 1 In an embodiment of the utility model, the flow field plate, the inlet area 1, the outlet area 2 and the reaction area 3 are formed on the flow field plate 100, a plurality of flow channels 31 are arranged in the reaction area 3, and the fluid flows into the outlet area 2 after flowing into the plurality of flow channels 31 in the reaction area 3 from the inlet area 1;The plurality of flow channels 31 include an inlet flow channel 311, two outlet flow channels 312 and two branch flow channel groups 313;The end of the inlet flow channel 311 is communicated with the inlet area 1;The end of each outlet flow channel 312 is communicated with the outlet area 2, and the two outlet flow channels 312 are arranged on the two sides of the width direction of the inlet flow channel 311;And each branch flow channel group 313 includes a plurality of branch flow channels 3131, one end of each branch flow channel 3131 is communicated with the side of the inlet flow channel 311, and the other end is communicated with the side of the corresponding outlet flow channel 312.
[0037] The technical scheme of the utility model discloses through set up the entrance area 1 on the flow field board 100, can be convenient fluid from the entrance area 1 enters, after each flow channel 31 in the reaction area 3, through the outlet area 2, wherein, fluid enters by the inflow channel 311, and through two branch flow channel groups 313, fluid is uniformly distributed, finally flows into the outflow channel 312, and through the outlet area 2, by setting a plurality of branch flow channel 3131 on the flow field board 100, achieve the purpose of distributing fluid uniformly in large area electrolytic cell, avoid the generation of mass transfer dead zone, effectively reduce the power loss during electrolysis, thereby improving electrolysis performance.
[0038] It should be noted that in the electrolysis process, the oxygen content generated by the anode catalytic layer rises to the flow channel layer, and forms a gas-liquid two-phase flow with liquid water. In the utility model, the flow field plate 100 is mainly used for anode flow field plate. Of course, the cathode flow field plate can also be applicable.
[0039] The setting mode of the two branch flow channel groups 313 is not limited. It can be parallelly arranged between the side of the inflow channel 311 and the side of the outflow channel 312, which is simple in manufacturing process. It can be arranged in a bending serpentine shape between the side of the inflow channel 311 and the side of the outflow channel 312, which has high mass transfer efficiency.
[0040] In some embodiments, the two branch flow channel groups 313 can also be arranged in an inclined manner. Compared with the parallel flow channel arrangement, the inclined arrangement has the purpose of improving uniform distribution. Compared with the serpentine flow channel, the inclined arrangement is simple in manufacturing process and can also efficiently transfer mass.
[0041] In some embodiments of the utility model, the two branch flow channel groups 313 are arranged in an inclined manner. The side of the inflow channel 311 can be arranged symmetrically or asymmetrically. The specific arrangement mode is described below.
[0042] Further, to achieve the purpose of small pressure drop in the reaction area 3, in the technical scheme of the utility model, the two branch flow channel groups 313 are symmetrically arranged with the length direction center line of the inflow channel 311 as the symmetry axis. In this way, by symmetrically arranging on both sides of the width direction of the inflow channel 311, the purpose of uniform distribution of fluid can be achieved, thereby reducing the pressure drop in the reaction area 3.
[0043] In addition, in order to improve the uniform distribution purpose, in the technical scheme of the utility model, each branch flow channel 3131 is arranged at intervals along the side of the inlet flow channel 311, and the intervals are the same; in this way, each branch flow channel 3131 is communicated at the side of the inlet flow channel 311, and the intervals are equal, so that the fluid distributed in each branch flow channel 3131 is more uniform.
[0044] Of course, in order to further achieve the purpose of simple manufacturing process and efficient mass transfer, in the technical scheme of the utility model, each branch flow channel 3131 is inclined towards the inlet flow channel 311 away from the side of the outlet flow channel 312, and the inclination angles are the same; in this way, compared with the parallel arrangement or the serpentine arrangement of the flow channels in the traditional flow field plate 100, the embodiment has the advantages of simple manufacturing process and more uniform distribution of fluid in each branch flow channel 3131, and smaller pressure drop, that is, less power required to pump water into the flow field plate 100, that is, less power consumed for electrolysis, thereby improving the electrolysis efficiency and better improving the uniformity of each flow channel 31 in the reaction zone 3, achieving the effect of efficient mass transfer.
[0045] It should be noted that the inclination angle of each branch flow channel 3131 towards the inlet flow channel 311 is forty-five degrees, and since the two branch flow channel groups 313 are symmetrically arranged with the length direction of the inlet flow channel 311 as the axis of symmetry, a bionic leaf-shaped flow channel design is formed in the flow field plate 100, so that water can more easily carry away gas while not causing excessive pressure drop; in the embodiment, by adopting the bionic leaf-shaped flow channel design, the large-area flow field plate 100 is divided into a plurality of branch flow channels 3131, which can significantly improve the uniformity of fluid distribution in the reaction zone 3.
[0046] In order to achieve the purpose of uniform inlet velocity of fluid in each branch flow channel 3131, in the technical scheme of the utility model, the width of the inlet flow channel 311 gradually decreases from the inlet zone 1 towards the outlet zone 2; in this way, when the fluid flows from the inlet zone 1, the inlet velocity of the fluid into each branch flow channel 3131 is ensured to be uniform, minimizing the pressure drop.
[0047] It should be noted that in the embodiment, the decreasing setting ratio of the inlet flow channel 311 is 1.6-1.2-0.6.
[0048] Specifically, in the case of a certain water inlet speed, the flow resistance at the inlet of each branch flow channel 3131 is the same, the speed of entering each branch flow channel 3131 is the same, the gas blocking area in the flow channel is less, and the entire flow field plate 100 can be lowered by the inclined arrangement of each branch flow channel 3131. The pressure drop is less, the power consumption is less, and the electrolysis efficiency is improved.
[0049] In order to achieve the purpose of the same flow rate of the two outflow channels 312, in the technical scheme of the utility model, the two outflow channels 312 are arranged in parallel on both sides of the width direction of the inflow channel 311; the length and / or width of the inflow channel 311 and the two outflow channels 312 are the same; in this way, the fluid in each branch flow channel 3131 can be received and discharged through the arrangement of the two outflow channels 312.
[0050] It should be explained that the length of the inflow channel 311 and the two outflow channels 312 can be set the same, the width of the inflow channel 311 and the two outflow channels 312 can be set the same; it can also be that the length and width of the inflow channel 311 and the two outflow channels 312 are set the same, and in the embodiment, preferably, the length and width of the inflow channel 311 and the two outflow channels 312 are set the same, so that the effect is better.
[0051] Of course, in order to ensure the consistency of the fluid received by the outflow channel 312, in the technical scheme of the utility model, the depth of each branch flow channel 3131 and the inflow channel 311 is the same; and / or, the depth of each branch flow channel 3131 and the outflow channel 312 is the same; and / or, the width of each branch flow channel 3131 and the width of the outflow channel 312 is the same; in this way, the depth of each branch flow channel 3131 and the inflow channel 311 can be set the same; it can be that the depth of each branch flow channel 3131 and the outflow channel 312 is set the same; it can be that the width of each branch flow channel 3131 and the width of the outflow channel 312 is set the same; it can also be that the depth of each branch flow channel 3131 and the inflow channel 311 and the outflow channel 312 is set the same, and the width of each branch flow channel 3131 and the width of the outflow channel 312 is set the same, in the example, preferably, the depth of each branch flow channel 3131 and the inflow channel 311 and the outflow channel 312 is set the same, and the width of each branch flow channel 3131 and the width of the outflow channel 312 is the same, to achieve the consistency of the fluid received by the outflow channel 312.
[0052] In addition, in order to ensure the uniform flow rate of the fluid, the width and / or depth of each branch flow channel 3131 is the same; thus, the width of each branch flow channel 3131 can be selected to be the same; the depth of each branch flow channel 3131 can be selected to be the same; or the width and depth of each branch flow channel 3131 can be selected to be the same; in the embodiment, preferably, the width and depth of each branch flow channel 3131 are selected to be the same, which can better ensure the uniform flow rate of the fluid in each branch flow channel 3131.
[0053] It should be noted that the size of the reaction zone 3 is designed to be 450*300mm, the size of the inlet zone 1 and the outlet zone 2 is designed to be 40*25mm, wherein the depth of each branch flow channel 3131 and the inflow channel 311 and the outflow channel 312 is designed to be 7mm, the width of each branch flow channel 3131 and the outflow channel 312 is designed to be 10mm, wherein the number of branch flow channels 3131 is designed to be 46.
[0054] The utility model also proposes a kind of electrolytic cell, the specific structure of the flow field plate of the electrolytic cell refers to above-mentioned embodiment, since the electrolytic cell has adopted all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer one by one elaboration.
[0055] The utility model also proposes a kind of electrolytic device, the specific structure of the electrolytic device refers to above-mentioned embodiment, since the electrolytic device has adopted all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer one by one elaboration.
[0056] The above-mentioned is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and the equivalent structural transformation made in the utility model's inventive concept, using the utility model specification and the contents of drawings, or direct / indirectly applied in other related technical fields are included in the patent protection range of the utility model.
Claims
1. A flow field plate characterized by, The flow field plate has an inlet area, an outlet area and a reaction area, and a plurality of flow channels are arranged in the reaction area, and fluid flows from the inlet area to the outlet area through the flow channels in the reaction area; The plurality of flow channels include: An inlet flow channel, the end of which communicates with the inlet area; Two outlet flow channels, the ends of each of which communicate with the outlet area, and the two outlet flow channels are arranged on both sides of the inlet flow channel in the width direction; and Two branch flow channel groups, each of which includes a plurality of branch flow channels, one end of each of the branch flow channels communicates with the side of the inlet flow channel, and the other end communicates with the side of the corresponding outlet flow channel.
2. The flow field plate of claim 1, wherein The two branch flow channel groups are symmetrically arranged with the center line of the length of the inlet flow channel as the axis of symmetry.
3. The flow field plate of claim 1, wherein Each of the branch flow channels is arranged at intervals along the side of the inlet flow channel, and the intervals are the same.
4. The flow field plate of claim 1, wherein Each of the branch flow channels is arranged to tilt away from the side of the outlet flow channel and towards the inlet flow channel, and the tilt angles are the same.
5. The flow field plate of claim 1, wherein The width of the inlet flow channel gradually decreases from the inlet area to the outlet area.
6. The flow field plate of claim 1, wherein The two outlet flow channels are arranged in parallel on both sides of the inlet flow channel in the width direction. The length and / or width of the inlet flow channel and the two outlet flow channels are the same.
7. The flow field plate of claim 1, wherein The depth of each of the branch flow channels is the same as that of the inlet flow channel; and / or, The depth of each of the branch flow channels is the same as that of the outlet flow channel; and / or, The width of each of the branch flow channels is the same as that of the outlet flow channel.
8. The flow field plate of claim 1, wherein The width and / or depth of each of the branch flow channels are the same.
9. An electrolytic cell characterized by, The flow field plate according to any one of claims 1 to 8.
10. An electrolysis device, characterized by The electrolytic cell according to claim 9.